Method of combusting nitrogen-containing fuels

Details Method of combusting nitrogen-containing fuels Method of combusting nitrogen-containing fuels

1975-12-29

1977-10-18

Favors, Edward G.

Combustion

Process of combustion or burner operation

Flame shaping, or distributing components in combustion zone

431 11, F23M 304

Patent

active

040544079

ABSTRACT:
A method for combusting nitrogen-containing fuel by: combusting a first fuel-air mixture in the presence of a catalyst in a first stage, operated fuel-rich so that the amount of air in the first stage is substantially less than the amount needed for complete combustion; adding additional air to the effluent gas from the first stage to form a second mixture with an amount of air at least sufficient to combust fully the effluent from the first stage; and then combusting the second mixture in a second stage. The first mixture is sufficiently fuel-rich, and the second mixture contains sufficient additional air, so that the combustion temperature in the first stage is below a temperature that would result in any substantial formation of oxides of nitrogen or other fixed nitrogen compounds from atmospheric nitrogen present in the mixture being combusted, and the second stage temperature also is below that for substantial nitrogen oxide formation therefrom. The method serves to suppress formation of nitrogen oxides from the nitrogen-containing compounds in the fuel.

REFERENCES:
patent: 3837788 (1974-09-01), Craig et al.
patent: 3914090 (1975-10-01), Pfefferle
patent: 3914091 (1975-10-01), Yamagishi
patent: 3928961 (1975-12-01), Pfefferle
patent: 3940923 (1976-03-01), Pfefferle

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